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What Was the Geocentric Model? How Did the Heliocentric Model Develop?

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Presentation on theme: "What Was the Geocentric Model? How Did the Heliocentric Model Develop?"— Presentation transcript:

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2 What Was the Geocentric Model? How Did the Heliocentric Model Develop?

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4 Earth in the center of the universe

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6 Pattern of the stars didn’t change over time Stars seemed to move, but stayed in the same position relative to one another Observed planets moving among the stars Early observers thought Earth was at the center of the universe (Chinese) Thought Earth was under a dome of stars (Greek) Thought the Earth was inside rotating spheres nested inside each other Ge is Greek for “Earth” Geocentric model: Earth is at the center of the revolving planets and stars

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8 (140 A.D.) Ptolemy further developed the geocentric model (Greek) Planets moved in small circles carried along in bigger circles Explained motions in the sky fairly accurately Accepted for nearly 1,500 years

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10 Sun in the center

11 Aristarchus developed a sun-centered model (Greek) Helio (Greek for “sun”) The Earth and other planets go around the sun Not well received in ancient times

12 (1543) Nicolaus Copernicus worked out the arrangement of the known planets and how they move around the sun More evidence was needed to convince many people

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14 (1500s) Tycho Brahe made more accurate observations Johannes Kepler (Tycho’s assistant) Figured out the shape of the planet’s orbit Elliptical (or oval shaped)

15 (Italian) Galileo convinced others that the heliocentric model was correct! (1610) Discovered 4 moons around Jupiter Not everything in the sky revolved around Earth Venus goes through phases similar to the moon It would not have a full set of phases if both it and the sun circled around Earth


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